My girlfriend and I stayed in Bangkok for about 10 days. Winyoo is involved in an NGO there that organises volunteers to teach English to local kids, from pre-school age to about age 12. Winyoo and other members of the NGO have been very friendly and helpful, and the volunteering experience has been just wonderful. We're missing the kids and their eagerness to learn already! It has been a wonderful 10 days.
The accommodation is part of the volunteering experience - we stayed in hostel-style rooms above a school. The rooms were basic but fine, and power and wifi were provided.
Stay with Winyoo in Bangkok if you get the chance, and you will get to know some wonderful local people - especially the kids!